DURABLE: This 8 piece hex nut driver set is made from durable chrome vanadium steel. MAGNETIC: The kit contains 6-point nut drivers with magnetic inserts. METRIC SIZES: 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm & 13mm. 1/4 INCH HEX SHANK: The set comes with a quick-change ¼” shank.